package servlet;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.Blog;
import model.BlogDao;
import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/getAuthorInfo")
public class AuthorInfoServlet extends HttpServlet {
    private ObjectMapper objectMapper=new ObjectMapper();
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1、拿到blogId
        String blogId=req.getParameter("blogId");
        if (blogId==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("请求中缺少blogId");
            return;
        }
        //2、在blogId表中查询到对应的Blog对象
        BlogDao blogDao=new BlogDao();
        Blog blog=blogDao.getBlog(Integer.parseInt(blogId));
        if (blog==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("blogId没有找到");
            return;
        }
        //3、根据blog对象中的userId，从user表中查到对应的作者
        UserDao userDao=new UserDao();
        User user=userDao.getUserById(blog.getUserId());
        if (user==null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("userId没有找到");
            return;
        }
        //4、把这个user对象返回到浏览器这边
        user.setPassword("");
        String respJson=objectMapper.writeValueAsString(user);
        resp.setContentType("application/json;charset=utf8");
        resp.getWriter().write(respJson);
    }
}
